/*
 * Copyright (c) 2019, 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.oracle.svm.core.posix.jdk11;

import static com.oracle.svm.core.posix.PosixJavaNIOSubstitutions.convertReturnVal;
import static com.oracle.svm.core.posix.headers.Unistd.write;

import java.io.IOException;

import org.graalvm.nativeimage.Platform;
import org.graalvm.nativeimage.Platforms;
import org.graalvm.nativeimage.StackValue;
import org.graalvm.nativeimage.c.type.CCharPointer;
import org.graalvm.word.WordFactory;

import com.oracle.svm.core.annotate.Substitute;
import com.oracle.svm.core.annotate.TargetClass;
import com.oracle.svm.core.jdk.JDK11OrLater;

@Platforms({Platform.LINUX.class, Platform.DARWIN.class})
public class PosixJavaNIOSubstitutions {

    @TargetClass(className = "sun.nio.ch.IOUtil", onlyWith = JDK11OrLater.class)
    @Platforms({Platform.LINUX.class, Platform.DARWIN.class})
    static final class Target_sun_nio_ch_IOUtil {
        // ported from {jdk11}/src/java.base/unix/native/libnio/ch/IOUtil.c
        // 107 JNIEXPORT jint JNICALL
        // 108 Java_sun_nio_ch_IOUtil_write1(JNIEnv *env, jclass cl, jint fd, jbyte b)
        @Substitute
        static int write1(int fd, byte b) throws IOException {
            // 110 char c = (char)b;
            CCharPointer c = StackValue.get(CCharPointer.class);
            c.write(b);
            // 111 return convertReturnVal(env, write(fd, &c, 1), JNI_FALSE);
            return convertReturnVal(write(fd, c, WordFactory.unsigned(1)), false);
        }
    }
}
